I always used to live in places where people don't know their neighbors.
20 years ago i moved back to the little town where I went to high school for 3 years eons ago.
Because it's a village with lots of walkable sidewalks and streets, and a 'real' Main Street, I have gotten to know MANY people in my neighborhood. Not all of them are people I have much in common with, but I like knowing them anyway.
I feel very lucky to live in such a village. Of course I do make part of that happen, because I make a point of often going up to strangers and talking with them, like if someone is out in their front yard gardening, or needs helps carrying something, or their child is wearing something interesting, etc. I have met SO many wonderful people that way, I make it a habit to get to know strangers even if only for a moment for a friendly hello. It works, and it's happily addictive.